condition mean min max ZT0-3 1.521925 1.521925 1.521925 ZT4-7 1.0180165 1.0180165 1.0180165 ZT8-11 1.1678549999999999 1.1678549999999999 1.1678549999999999 ZT12-15 2.06299 2.06299 2.06299 ZT16-19 1.660855 1.660855 1.660855 ZT20-23 1.97014 1.97014 1.97014